The Japanese yen has weakened significantly against the US dollar, with the USD/JPY exchange rate climbing above 153, marking its highest level since July. USD/JPY extended gains, rising 1% to 152.65 at its day's high. This surge comes as Japan's 40-year government bond yield rose to 2.535%, the highest since 2008, amid a broader increase in global yields. The US 10-year Treasury yield also reached 4.25%, its highest level since July, driven by market volatility and investor reassessment of the Federal Reserve's rate cut path. The 10-year Treasury yield was last reported at 4.24% and 4.23%. These developments have sparked concerns about potential economic impacts and the possibility of currency intervention in Japan.